Grinding-wheel-trimming mechanism.



W. P. WAGNER.

GRINDING WHEEL TRIMMING MECHANISM.

APPLICATION FILED MAY 26,1913.

Patented Jan. 5,1915.

INVENTOR WITNESSES:

W. P. WAGNER.

GRINDING WHEEL TRIMMING MECHANISM.

APPLICATION FILED MAY 26.1913. I

3A3? Patented Jan. 5, 1915.

3 SHEETS-SHEET Z.

INVENTOR.

$0M w awaww flow (7620M W. F. WAGNER.

GRINDING WHEEL TRIMMI'NG MECHANISM. APPLICATION 'FILED MAY 26,191-3.

Patented Jan. 5, 1915.

3 SHEETS-SHEET 3.

Fig. 3. F 1' 4:.

W 7 E 2/ NW 22\\ .9.- @HEZJ WITNESSES: INVENTOR;

determined 'WILLIAM F. waen'na, or camera, MIcnrean.

GRINDING-WHE EL-TRIMMING MECHANISM.

Continuation of application Serial No. 484,427, filed March 19; 1909. This Specification of Letters Patent.

Patented Jan. 5, 1915. application filed May 26, 1913.

Serial No. 769,897.

To all whom it may concern:

Be it known that 1, WILLIAM F. VVAeNEn, a citi-zen'of the United States, and a resident of Detroit, in the county of Wayne and State of Michigan, have invented a certain new and useful Grinding-Wheel-Trimming Mechanism; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the figures and letters of reference marked thereon, which form a part of this specification.

This invention relates to grinding-wheel trimming mechanisms of the class especlally applicable to the truing of gear grinding wheels to maintain the operative surfaces thereof perfectly uniform for acting on successive teeth, but is not to be understood as being limited for use in such connection as it may be employed for the trimming of any grinding means having its operative surface specially shaped to suit the surfaces to be ground.

The object of my invention 15 the prov1- sion of a highly efficient mechanism of this .class which is simple and accurate in its operation, strong and durable of construction, and capable of being easily and quickly adapted for the trimming of the working surface of a grinding medium in any preshape to suit it to the shape of the surfaces to be operated on, thus increasing the practicability, working efiiciency and commercial value of machines of this class.

A further object of my invention is the provision of simple and improved meansfor automatically adjusting the grinding medium after each operation to compensate for the amount .of material removed from the working surface thereof at such operation. v

The operation, construction and arrange ment of the parts of the invention are fully described in the following specification, and while, in its broader aspect, it may be ernbodied in different forms of machines and its parts difl'erently arranged and constructed, a preferred form of the same is illustrated in the accompanying drawings, in which,

Figure 1 is aside elevation of a machine grinding-wheel embodying my invention with portions broken away. Fig. 2 is a plan view of the same. Fig. 3 is a vertical transverse section of the same on the line w-w in Fig. 1. Fig. 4 is an elevation of one end of the machine with portions broken away. Figs. 5 and 6 are enlarged plan and side views, respectively, of the trimmer parts with portions of the same broken away. Fig. 7 is an enlarged section of the grinding-wheel carrying-head and associated parts taken on the line g y in Fig. 1. Fig. 8 is a section on the line 20-41; in. Fig. 4:, and Figs. 9 and 10 are side and plan views, respectively, of the block which coacts with the trimmer adjusting parts to effect an adjustment thereof.

Referring to the drawings; 1 designates the frame of my machine, which is shown as having the elevated ortions 2 and 3 at the opposite ends thereof. Mounted on the top of the frame part 2 for reciprocatory movements in a slide-way 4 extending longitudinally of such partis a carriage 5, which carries at its enner end a revoluble grindingwheel 6, of emery, carborundum or other suitable material for successive movements forward and backward across the face of a gear wheel or other work 7 to be ground, which is carried as hereinafter described. The grinding-wheel 6 is disposed between a pair of standards 8, 8 rising from the inner end portion of the carriage 5, and the end portions of its shaft 9 are journaled in bearing-blocks 1O, 10 carried by said standards. For the purpose of adjusting the relative to the carriage to compensate for wear on such wheel during the grinding and trimming operations, as hereinafter described, the blocks 10 are mounted in inclined ways 11 provided in the standards to enable them, when moved in one direction therein, to 'efiect both a lowering and forward adjustment of the grindingwheel, the ways preferably having a 45 incline to cause both of such lowering and forward adjustments to be equal.

Each bearing-block 10 has an extension:

10 extending upwardly in'itsway andiri sliding interlocking engagement at itsupperend with the lower tapered surface 12 of a block 13, which is mounted for horizontal sliding movements in the upper portion of the associated standard 8. For this purpose the standard has its upper portion cored longitudinally of the machine frame and formed with internal horizontal ribs 14, 14 which work in complemental grooves in the sides of the block, as shown in Figs. 1 and 7. The two Wedge-blocks 13, 13 are connected at their rear ends by a yoke 15 from which a horizontal rack-bar 16 projects, as shown. This rack-bar is guided in its reciprocatory movements by a pedestal bearing 5, rising from the carriage 5, which bearing also forms a bearing for the transversely-disposedshaft 17 carrying the pinion 18 for meshing with said rack-bar. A ratchet-wheel 19 is carried at one end of the shaft 17, and engaging with this is a dog 20, which is carried by a pendent arm 21, which loosely hangs from the shaft 17, see Figs. 1 and 3. The arm 21 extends down at the side of the carriage 5 and has a slight oscillation imparted thereto at substantially the limit of each rearward movement of the carriage due to its contact with a stop-screw 22, which is carried by the frame part 2 in the path of movement of such arm as shown in Figs. 1

and 2. As the arm is oscillated from its 'normal position a partial rotation is imparted to the shaft 17 through the medium of the ratchet-wheel 19 and dog 20, thus communicating a slight forward movement to the rack-bar 16 and attached blocks 13, 13, which effects a consequent slight movement of the'bearing-blocks 10 down the inclined ways 11 of the standards 8. It is evident that the throw of the arm 21 is regulated by an adjustment of'the stop-screw 22. v

The shaft 9 carrying the grinding-wheel is shown as being driven by a belt 23, which connects the pulley 24 on the wheel shaft and the drive-pulley 25, carried by a line or other shaft 26. The course of the belt 23 is guided intermediate the pulleys 24 and 25 by the two idlers 27, which are carried at the rear or outer end of the carriage 5 in a suitable manner.

The requisite forward and backward movements are imparted to the carriage 5 by any suitable reversing mechanism, A simple means for performing this consists in providing the bottom of the carriage 5 with a longitudinally-extending rack 28 with which a pinion 29 on the shaft 30 meshes. The shaft 30 hasone end projecting beyond its bearing in the frame side and carries a pulley 31, which is driven from a pulley 32 on a shaft 33 by a connecting belt 33. The shaft 33 is shown as being disposed at one side of the frame 1, longitudinally thereof, and has reverse rotation successively imparted theretoirom a continuously revolving line or other drive-shaft (not shown) by the straight and crossed belts 34, 34, whic are alternately moved by a belt shifting eye 35 into engagement with one or the other of the fixed pulleys 36, 36 on the shaft 33 and the intermediate loose pulley 37 thereon, as is common in planing machines or the like.

The shifter-eye 35 is automatically shifted first in one direction and then another due to lugs 38 and 39, which are carried by the carriage 5 at one side thereof striking a registering-lug 40 on such eye when the carriage is near the limits of its forward and backward movements, Fig. 2.

The grinding-wheel trimming mechanism of my invention is shown in the present instance as being mounted on the elevated portion 3 of the frame in position to act on the Working surface of the grinding-wheel 6. This mechanism is carried by a bracket or block 41, which is secured to one side of the frame part 3 for adjustment longitudinally of the machine by reason of retaining bolts 42 passing through a slot 43 in such bracket, see Flg. 8. Rising from near'the outer edge of the bracket or block 41 is a standard 44, the nner face of which is provided with a vertical guide-way 45 -in which the inner end of a horizontally-projecting bracket 46 is mounted for vertical adjustment. This bracket projects over the top of the frame part 3 and has its free end angled forwardly in substantially the plane of reciprocation of the grlnding-wheel 6 and provided with an upwardly projecting stud 47. 48 and 49 designate two trimmer carrying armswhich project rearwardly from the stud 47 with theirrear ends in horizontally-spaced relation and carrying the opposed trimmer members 50, 50, and their forward ends broadened with one lapping over the other, as shown, and both pivoted on the stud 47, whereby an opposed oscillation of said trimmer arms will effect a contraction orretraction of the inner ends of the trimmer members 50,'50., These trimmer members are shown as constituting stems or screws which are threaded through the arms 48, 49 for the purpose of adjustment, and have their inner ends provided with suitable trimmer points, such for instance as diamonds.

The broadened ends of the arms 48, 49 are vertically spaced from each other, as by squarlng an interposed portion of the stud 47 see Figs. 5 and 6, and are formed at one edge thereof with opposed segmental racks 51, 51, with which a pinion 52 meshes. This pinion is carried by a shaft or spindle 53, which projects from the squared portion of the stud 47, and it is evident that when one of the arms is oscillated a corresponding reverse oscillating will be communicated to the other arm through the medium of said pinion.

Projectin laterally andrearwardly from the forwar or enlarged end of one of the arms 48, 49, in the present instance the latter, is an arm 54, which has its free end terminating in position to make contact with a templet or form 55, on the forward end of respectively, see

preheat m the carriage 5, at the instant the nose of the grinding-wheel enters between the trimmer points of the trimmenmembers 50, 50, which members are disposedin a horizontal plane with the axis of said wheel. The templet or form 55 is secured to oneside of the forward end of the carriage 5 b screws 56, which pass through a longitudinal slot 57 (Fig. 1) in said templet to. adapt it for longitudinal adj ustment, and has one side of its nose, or the surface thereof which contacts with the end of the arm 54, fashioned, as shown at a, to conform exactly to the shape of a side of the working surface of the grinding-wheel 6. As the nose of the grinding-wheel enters between the po nts of the trimmenmembers 50, which are adjusted to suit the width of the outer edge of the wheel, the nose of the templet moves into contact with the outer side edge of the free end of the arm and as such arm end slides in contact with the surface a of said templet from one end to the other thereof during the remainder of the forward stroke of the carriage, the trimmer end of the member 50 carried by the arm 49 is caused to move to trim the contiguous side I) of the wheel 6 in a shape corresponding to that of the surface a of the templet, due to the rigid connection of the arms 49 and 54. The meshing ofthe pinion 52 with the opposing racks 51, 51 on the two arms 48, 49 causes the trimmer point of the arm 48 to move in the opposite direction to the movement of the companion trimmer point and in unison therewith, whereby to trim the opposite face 6 of the wheel as the working surface of the wheel tween.

On a receding of the templet 55 from engagement with the end of the arm 54, the points of the trimmer members 50, 50 are caused to return to their normal positions by the action of a contraction spring 58, which has its ends attached to the arms 48, 49, as shown. '-Coactin arms 48, 49 limit their mward movements.

It is apparent that the working surfaces 7), b of the grinding-wheel maybe trimmed in any predetermined form to conform to the shape or size of the surfaces actedon by simply substituting a templet 55 of the required shape for the one on the machine.

F or the purpose of automatically lowering the bracket 46 to keep the trimmer points of the arms 48, 49 in the horizontal plane of the grinding-wheel6 as it lowers to compensate for wear, such bracket is mounted on a wedge block 60, which in turn rests for longitudinal sliding movements on top of the bracket 41, which is secured to the frame part 3, said block having slidingv tongue and groove connection with both of said brackets, as shown 1n F g. 4. When the carriage 5 is near the hunt of its forpasses therebe- I stops 59' on the.

ward'movement the end of a forwardly projecting arm 61, which is adjustably secured to the forward end of the carriage at the side thereof opposed to the templet 55, moves into contact with and effects an oscillation of an upwardly projecting arm 62, which is loosely carried by a shaft 63, that isjournaled in the bracket 41. The lever 62 normally stands in upright position due to its lower end projecting below the shaft 63 and being weighted, as shown.

The shaft 63 carries a ratchet-wheel 64 with which a dog 65 on the lever 62 engages to.impart intermittent rotation to such shaft when the lever is oscillated in one direction, and also carries a pinion 66, which meshes with a rack 67 provided longitudinally of the under side of the wedge-block '60. It is thus apparent that on an oscillation of the lever 62 a partial rotation is communicated to the pinion 66, which in turn moves/the block 60 in the proper direction to effect a lowering of the trimmer parts.

The trimming of the peripheral edge 0 of the grinding-wheel 6 to maintain such edge uniform in shape is accomplished by the reciprocatory movement of a trimmer point 68 across the edge 6 of the wheel. This trimmer-point is. carried at an end of a rod or bar 69, which projects loosely through an opening 70 in the trimmer arm 49, thence through a bearing in the inner enlarged end of the bracket 46 and an opening 71 in-the guide standard 44., and has its opposite end bent laterally and working-in a cam groove in the broadened hub portion 72 of a pulley 73, whereby a longitudinal reciprocatory movement is imparted thereto when the pulley' is rotated. The pulley 73 is loosely carried by a shaft 74, which projects from the inner end of the bracket 46 through the opening 71in the guide-standard and such Dulley has rotation communicated thereto from any source by a belt 73. The trimmer point 68 projects rearwardly from the contiguous end of the bar 69 and is positioned to engage the edge of the grinding-wheel at the limit of each forward movement thereof so that such edge is trimmed very slightly after each grinding operation.

The gear or work 7 to be ground is mounted on the inner end of a mandrel 75, which is journaled in a block .76, and has its forward end projecting in advance of the frame part 3 and carrying a worm-wheel 77. The block 76 is mounted for vertical adjustment within ways 78 provided in the frame part 3, and is adjusted by the turnin of a handscrew 79, which is threade" through a portion of the frame below said block and has its upper end swiveled to the bottom of the block, see Fig. 1. Meshing with the worm-wheel 77 is a worm 80, the shaft81 or which is journaled in beari gs 82, 82 secured to the forward end of the wheel 83 at one side of the frame, and also a loose forked lever 84, which straddles the ratchet-wheel and carries a spring-pressed dog 85 for engagement with said wheel. The lever 84 is oscillated by the reciprocatio of a rod 86, which is carried by bearinglugs 87 on the inner side of one of the frame sides with its forward end rojected through a registering opening 88 Figs. 1 and 4) in the frame and bent laterally to adapt it to project through a longitudinally extending slot 89 in the outerend of such lever. The inner end of the rod 86 carries a roller 90,- which works within a slot 91 in the lower end of a lever 92. This lever is fulcrumed to a stud or shaft 93 within the frame part 2 and has its upper end normally disposed in position to be engaged and rocked by a boss 94 projecting down from thebottom of the carriage 5, when such carriage is near the limit of its rearward movement. The lever 92 is normally held in one position of its movement withits upper end forward due to the action thereon of a weight 95 which is carried by an arm 96 projecting forwardly from the lever at its fulcrum oint. The throw of the rod 86 is regulated y means of a stop-screw 97, which is threaded through a bracket 98 at one end of the frame with its inner end projected within the frame in position to coact with the lower end of the lever 92 on its rearward movement. A graduated gage-bar 99 is carried by the screw 97 and works through a registeringopening in the bracket 98 to assist in finding a desired adjustment of the screw. This adjustment must be such that the lever 92 will have a sufficient throw, when engaged by the carriage on its rearward movement, to turn the gear-wheel 7 a distance equal to the width of a tooth thereof, through the medium of the intermediate parts.

The operation of the invention is as followsi The gear? or other work to be ground being placed on the mandrel 75, the carriage reversing mechanism is set in motion so as to effect a movement of the carriage5 to move the grinding-wheel 6 forward and backward-across the face of the gear 7 to successively pass through the grooves between the successive teeth thereof on each forward movement of the wheel as the gear is intermittently rotated for'such purpose. As soon as the grinding-Wheel on its forward movement has crossed the gear 7 the nose thereof enters and moves a distance equal tothe depth of the working surfaces b 7) between the trimmer points of the mem bers 50, 50 carried by the arms 48, 49 In stantly upon the nose of the wheel enterin between said trimmer points-thefa'ce a o the templet or form 55, which is properly '51 on their forward enlarged ends.

' operations.

adjusted for such purpose, moves into contact with the free end of the arm 54, attached to the trimmer arm 49, and, as it continues in contact therewith for the remainder of the forward stroke, effects corresponding opposed movements of the trimmer points and a consequent trimming of the respective sides I) of the wheel into a shape conforming to that of the face a of the templet. The opposed movements of the arms 48, 49 in unison when the latter is oscillated is effected by reason of the interposed pinion 52 meshing with the racks 51, When the grinding-wheelis at its limit of forward movement the rapid reciprocation of the trimmer-point 68 across thewedge c of the grinding-wheel, which movement is actuated by the revolving cam-hub of the ulley 73, effects a trimming of such edge. hen the carriage. on its return stroke is near the limit of its rearward movement a slight forward movement is communicated to the wedge-blocks 13, 13 relative to the standards 8, 8 due to the lower end of the arm )21 striking the stop screw 22 and communicating movement to the rack-bar 16 through the medium of the dog 20, ratchet-wheel 19, shaft 17 and pinion 18. The movement thus imparted to the wedge-blocks 13, 13 is so regulated that the requisite lowering movementis imparted to the bearing-blocks 10, 10 down the inclined ways 11, 11 to lower and advance the grinding-wheel a sufficient distance to compensatefor the material removed from the working surface of the wheel during the grinding and trimming As very little material is removed from the grinding-wheel at each of such operations it will be appreciated that it is only necessary to lower and advance the wheel a proximately one-thousandth of an inch or ess. The lowering of the trimming mechanism so that the trimmer points always stand in the horizontal plane of the wheel axis, is accomplished when the carriage is substantially at the limit of its forward movement due to the end of the arm 61 on the carriage striking and oscillating the lever 62 to impart a slight movement to the wedgeblock 60 through the medium of the ratchet-wheel 64, dog 65, pinion 66 and rack" 67, whereby to lower the bracket or block 46, carrying the trimmer parts, the requisite distance. After the grindingwheel 6 has crossed the gear 7 on its return stroke, the gearis shifted to place the next notch to that just operated on in register with the grinding-wheel by reason of the boss 94 on the carriage striking the upper end of the lever 92 when the carriage is near the limit of its rearward movement and moving the lever therewith during the remainder of such movement. This movement of the lever is communicated to the meager mandrel 7 5 carrying the gear 7 through the rod 86, shaft 81, worm 80, and worm-wheel 7 7, the adjustment and proportions of which parts are so regulated as to impart the desired movements to the gear.

It is apparent that to change the machine to adapt it for operating on work of different shape or size it is only necessary to substitute a templet 55 of the desired .form for the one on the machine, and to primarily adjust the positions of thergrinding- Wheel, the trimmer parts, and the throw of the lever 92 as the size of the work and the dis tance apart of the notches in its face may require; and also that the trimmer parts are not restricted to use at the forward end of the machine, but may if desired be positioned to coact with the grinding-wheel when at the rear end of its throw without departing from the scope of the invention.

I wish it understood that my invention is not limited to any specific arrangement and construction of parts except in so far as such limitations are specified. in the claims.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is,

1. In a machine of the class described, the combination of a grinding-wheel, a set of relatively movable trimmer parts, means connecting said parts to have trimming movements imparted thereto in unison when one is moved, said wheel and parts being capable of relative movements toward and away from each other, and a member adapted to act on one only of the trimmer parts at a predetermined point in the relative movement of said parts and wheel to impart predetermined trimming movements to said part and its companion in arcs of a common circle.

2. In a machine of the combination of a grinding-wheel, a trimmer mechanism for said wheel, said wheel and mechanism being capable of relative movements toward and away from each other, said trimmer mechanism comprising a set of pivotally connected oscillatory trimmer parts between which the Working surthe class described,

face of the wheel is adapted to pass, one.

of said parts having an arm projecting therefrom, means for effecting opposed movements of said parts in unison in arcs of a common circle when said arm is moved, and means with which said arm coiiperates at a predetermined point in the relative movements of said wheel and trimmer mechanism whereby to impart the' requisite trimming movements to said trimmer parts.

3. In a machine of the class described, the combination of a reciprocatory grinding-wheel, a trimmer mechanism disposed in the plane of reciprocatory movements of the axis of said wheel and having a plurality of trimmer parts movable in unison in arcs of a common circle, and means reciprocally movable with said wheel and adapted to cotiperate with said trimmer mechanism when said wheel is at a predetermined point in its movement to impart trimming movements to said trimmer mechanism parts.

4. In a machine of the class described, the combination of a reciprocatory grinding-wheel, a trimmer mechanism disposed in the path of movement of said wheel and having difi'erent trimming members movable in arcs of a comon circle, and means movable with said wheel for acting on a part of said mechanism to impart trimming movements to said trimming members.

5. In a machine of the class described, the combination of a grinding-wheel, a trimming mechanism having trimmer parts pivotally connected and geared to have opposed oscillatory movements in unison when one is moved and one of said parts having a projection, said wheel and mechanism being capable of relative movements toward and away from each other, and means adapted to coact with the projection on one of said trimmer parts at a predetermined point in the relative movement of said wheel and mechanism whereby to impart trimming movements in arcs of a common circle to said trimmer parts.

6. In a machine of the class described,

the combination of a grinding-wheel having its ;wor to be operated on, a movable carriage eripheral portion shaped to suit the carrying said wheel, a trimmer mechanism movable in arcs of a common circle to trim the operating surface of the wheel, and means automatically operable at a predetermined pointin a movement of the carriage for acting on the trimmer mechanism to impart trimming movements thereto.

7. The combination of a grinding-wheel, a reciprocatory carriage carrying the same, a set of oscillatory trimmer parts for trimming the operating surface of the wheel, said trimmer parts being movable in unison in arcs of a common circle, and means reciprocally movable with the carriage for acting on one of said trimmer parts to move the same to trim the operating surface of the wheel in a predetermined shape when the carriage is at a predetermined point in its movement.

8. The combination with a grinding-medium, and a mount therefor, of a set of oscillatory trimmer-members geared to. have corresponding opposed oscillatory movements in unison. and means fixed relative to said mount and adapted to coiiperate with said members to impart predetermined trimming movements thereto.

9. The combination with a grinding-medium, of a set of oscillatory trimmer parts, means connecting said parts to cause them to have opposed corresponding movements in unison and in arcs of a common circle to trim opposed working surfaces of said medium, and a templet movable to intermittently act on one of said trimmer parts to impart predetermined trimming movements to said parts.

10. The combination with a grinding wheel, of an oscillatory part for trimming a side working surface thereof, a templet movable to intermittently act directly on said part to cause it to move to trim the working surface of the wheel in other than the arc of a circle, and means automatically operative to move said templet.

- -11.. The combination with a grindingwheel, of a set of oscillatory trimmer parts adapted to have opposed corresponding movements in unison, and a templet for in: termittently acting directly on one of said parts to cause said parts to move to trim each of the opposed working surfaces of the wheel in other than an arc of a circle.

12. The combination with a grindingwheel, of a set of oscillatory trimmer membershaving a common axis, and means movable to effect an intermittent oscillation of such members to trim the working surface of the wheel.

13. In combination, a grinding-wheel, a reciprocatory mount therefor, a set of oscillatory members movable in arcs of a common circle for trimming opposed surfaces of the wheel, means connecting said members to cause them to have opposed trimming movements in unison, one memberhaving an arm projecting therefrom, and a templet car ried by said mount and adapted to impart predetermined trimming movements to said members.

14. The combination of a grinding-wheel, a reciprocatory mount therefor, opposed trimmer members carried bya common pivot and adapted to act to trim opposed sur-- and mechanism being capable of relative movements toward and away from each. other, and a'templet associated with said wheel and adapted to act on one of said trimmer members at a predetermined point in the relative movement of said wheel and trimmer mechanism whereby to impart predetermined trimming movements to the members of said mechanism.

In testimony whereof I have hereunto signed my name to this specification in the presence of two subscribing witnesses.

WILLIAM F. WAGNER:

Witnesses:

ANTHONY GLUEoKLIoH, J osnrnmn KELLY. 

